If the blued finish is worn, but not rusted or damaged, it is possible to have it re-blued without polishing, and it turns out well, at least it has on the ones I have personally done that way. But I agree with everyone else in advising against any type of complete re-finishing for yours. Applying some cold blue on the worn areas won't hurt if it makes you feel better. But it's not a permanent fix.

To paraphrase one earlier posting, if you want a gun which looks like new, you should buy a new gun.